Expose basic way to send test email

most of the mechanics of sending email could already be tested by
sending a "preview" email of any type, or e.g. via Feedback.  but it
seemed like the Configure Email Settings page should have a dedicated
way to test sending

tailbone/views/email.py

@@ -297,6 +297,22 @@ class EmailSettingView(MasterView):
                          'true' if data['hidden'] else 'false')
         return {'ok': True}
 
+    def send_test(self):
+        """
+        AJAX view for sending a test email.
+        """
+        data = self.request.json_body
+
+        recip = data.get('recipient')
+        if not recip:
+            return {'error': "Must specify recipient"}
+
+        app = self.get_rattail_app()
+        app.send_email('hello', to=[recip], cc=None, bcc=None,
+                       default_subject="Hello world")
+
+        return {'ok': True}
+
     @classmethod
     def defaults(cls, config):
         cls._email_defaults(config)
@@ -318,6 +334,16 @@ class EmailSettingView(MasterView):
                         permission='{}.configure'.format(permission_prefix),
                         renderer='json')
 
+        # send test
+        config.add_route('{}.send_test'.format(route_prefix),
+                         '{}/send-test'.format(url_prefix),
+                         request_method='POST')
+        config.add_view(cls, attr='send_test',
+                        route_name='{}.send_test'.format(route_prefix),
+                        permission='{}.configure'.format(permission_prefix),
+                        renderer='json')
+
+
 # TODO: deprecate / remove this
 ProfilesView = EmailSettingView